Improvement in machines for dressing the joints of hinges



L. P. SUMMERS.v

Machines for Dressing the Joints of Hinges.

No.i5i,632. Paientediune 2.1874.'

AM. #HdM-L WMM/'HIC Ca. M )f (asian/wir Moses s.)

UNITED STATES PATENT OFFICE LUCIUS I?. SUMMERS, OF NEW BRITAIN,CONNECTICUT, ASSIGNOR T() I). AND F. CORBIN, OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR DRESSING THE JOINTS OF HINGES.

Specification forming part of Letters Patent No. l 51,632, dated June 2,1874; application iiled May 7, 1874.

To all whom it may concern Be it known that I. LUcIUs P. SUMMERs, of NewBritain, in the'c'ounty of Hartford and State of Connecticut, haveinvented an Improvement in Machinery for Finishing the Joints of Hinges,of which the following is a specification The ordinary method offinishing up metal butt-hinges is to dress off the contiguous faces ofthe joint, set the leaves together, bore the hole for the pin, and thenfile or grind olf the metal around the joint. The hinge, while beingfiled, is held in a vise, and the surface of the joint is dressed off indetail. This necessitates frequent opening and closing of the hinge.Great difficulty arises in making the rounded or cylindrical portions ofthe joints of uniform diameter and concentric with the hinge-pin,otherwise the surfaces will not correspond with each other when thehinge-leaves are either open or closed; and, furthermore, the hingesfinished by hand are liable to be flattened at some portions of thesurface, especially if the hinge is not turned in the vise during theprocess of filing.

My improvements are made for finishing up the joint between the leavesof the hinge with great rapidity and perfection, and at a great savingof labor.

The hinge is grasped between two centers that enter the female centersof the joint. One of these centers is movable, and pressed up by aspring and lever. These centers are in a stock that slides vertically ina moving frame or carriage. The hinge, stock, and carriage are broughtalong by the operator beneath a reciprocating planing or filing tool,and the surface dressed, andthe hinge opened and turned until allportions of the joint are -iinished oft' true With each other, andequidistant from the axis or jointpin. The hinge is pressed up towardthe filing or finishing tool, and the pressure is relieved, so that thehinge is not pressed to the tool as the latter is moving back, therebylessening friction and Wear on the tool.

In the drawing, Figure l is a general plan of the machine. Fig. 2 is aside view. Fig. 3 is a cross-section at the line x. Fig. 4 is anelevation at the operative end of the hingeholder, and Fig. 5 is a planof the mechanism for dropping the hinge-holder and hinge on the returnmovement of the tool.

The machine is made with a suitable bed, a, and pillar-blocks b,supporting the shaft c, that is driven by a crank or by a pulley andcompetent power. The filing or finishing tool d is made like a saw, withthe cutting-edges of the teeth so beveled that they cut when moving awayfrom the operator, by preference, and hence as the tool moves toward theoperator, on the return stroke, the hinge should be dropped out of theway, as hereafter described. This tool slides in a head-block, j', andis reciprocated by a crank and pitman, g, and h is an arm extending`from the head-block, serving as a support and a guide for the back ofthe tool. The hinge holding carriage Z slides transversely of themachine in slides in the bed a, and it carries, in vertical guideways,the stock m, that is provided With center-pins i and o for the hinge r.The pini is stationary, but the pin o is movable endwise by the lever oand eccentric or crank on the shaft of the lever acting in a jaw at theend of the pin o,

and this lever o is acted upon by a spring, s, so that the point 0 ispressed toward i, and holds the hinge firmly; but the hinge can beeasily taken out or reversed by moving the lever o and withdrawing thecenter o. It is to beunderstood that the centersi and o enter the femalecenters in the ends of the joint, and that the leaves of the hinge areheld together by the joint-pin, the center holes left at each endallowing for the insertion of ornaments. The shaft t that passes acrossthe carriage l is provided with cams u u., beneath the stock m, and anarm, t', and a treadle or lever, u', serves to raise the stock m, andpress the hinge toward the reciprocating-cutter, andv the operator maylessen the pressure of the foot on the treadle to allonr the hinge todrop on the return movement of the cutter; but I prefer to employ thelifter-shaft 4, with cams 5 resting upon the cams u, and this shaft 4and cams 5 will be lifted bodily by the treadle u', lever-arm t', shaftt, and cams u, when the hinge-stock m and hinge are raised, the shaft 4being in slotted guides in the carriage Z, so as to alloW of thismovement, and at the end of the shaft 4 is an arm, r', that is acteduponl by a lever, s', and segmental cam o', so as to rock the shaft 4and press the hinge toward the cutter d While said cutter is operating,and release the pressure upon the return motion of the cutter or file.

By these means the operation becomes automatic, and the attendant canhold the leaves of the hinge in his hands, and turn them back and forthupon the centers, and also open and close vthe aps, which is necessaryto dress off the cylindrical portion of the joint smooth and true., andclose up to the leaves or iiaps.

I claim as my invention- 1. The reciprocating ling or cutting tool, incombination With centers for centering the holes at the ends of thejoint of the hinge, and sustaining such hinge While turned and operatedupon by the cutter, substantially as set forth.

2. The center o, cammed lever o', and spring s, in combination with thefixed center and the reciprocating cutting-tool for dressing ofi' thecylindrical joint of the hinge, substantially as set forth.

3. The hinge-holding stock m and centers i and o, sliding vertically inthe carriage l, in combination with the tool d, and with mechanism forraising the stock and hinge toward the tool, substantially as set forth.

4. The lever s', arm r', and shaft 4, in combination with thehinge-holding stock and reciprocatin g tool, substantially as set forth,for automatically relieving the hin ge from the cutter on the returnmovement of the latter, substantially as set forth.

In Witness Whereof I have hereunto set my signature this 1st day of May,A. D. 1874.

L. l). SUMMERS.

Witnesses:

CHARLES Piron, E. L. PRIOR.

